You CAN open up the lamp from the front. The little bezel piece comes off and then the glass comes off rather easily. The reflector is proprietary and a good part of their success. I haven't had my mitts any further into this thing, though.

Is there a way to tell if an HID light is near it's life-end?
I didn't think so, but I've noticed the inside of the front protective glass getting more and more hazed over time. (This is a TrailTech sourced bulb)
Al